Gravity and handedness of photons
arXiv:1705.07082 · doi:10.1142/S0218271817420019
Abstract
Vacuum fluctuations of quantum fields are altered in presence of a strong gravitational background, with important physical consequences. We argue that a non-trivial spacetime geometry can act as an optically active medium for quantum electromagnetic radiation, in such a way that the state of polarization of radiation changes in time, even in the absence of electromagnetic sources. This is a quantum effect, and is a consequence of an anomaly related to the classical invariance under electric-magnetic duality rotations in Maxwell theory.
First Award in the 2017 Essay Competition of the Gravity Research Foundation